Energy transfer driven brightening of MoS2 by ultrafast polariton relaxation in microcavity MoS2/hBN/WS2 heterostructures

Zehua Hu (), Tanjung Krisnanda, Antonio Fieramosca, Jiaxin Zhao, Qianlu Sun, Yuzhong Chen, Haiyun Liu, Yuan Luo, Rui Su, Junyong Wang, Kenji Watanabe, Takashi Taniguchi, Goki Eda, Xiao Renshaw Wang, Sanjib Ghosh, Kevin Dini (), Daniele Sanvitto, Timothy C. H. Liew and Qihua Xiong ()
Additional contact information
Zehua Hu: Nanjing University
Tanjung Krisnanda: National University of Singapore
Antonio Fieramosca: CNR NANOTEC Institute of Nanotechnology
Jiaxin Zhao: Nanyang Technological University
Qianlu Sun: Nanjing University
Yuzhong Chen: Beijing Academy of Quantum Information Sciences
Haiyun Liu: Beijing Academy of Quantum Information Sciences
Yuan Luo: Tsinghua University
Rui Su: Nanyang Technological University
Junyong Wang: National University of Singapore
Kenji Watanabe: National Institute for Materials Science
Takashi Taniguchi: National Institute for Materials Science
Goki Eda: National University of Singapore
Xiao Renshaw Wang: Nanyang Technological University
Sanjib Ghosh: Beijing Academy of Quantum Information Sciences
Kevin Dini: Nanyang Technological University
Daniele Sanvitto: CNR NANOTEC Institute of Nanotechnology
Timothy C. H. Liew: Nanyang Technological University
Qihua Xiong: Beijing Academy of Quantum Information Sciences

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Energy transfer is a ubiquitous phenomenon that delivers energy from a blue-shifted emitter to a red-shifted absorber, facilitating wide photonic applications. Two-dimensional (2D) semiconductors provide unique opportunities for exploring novel energy transfer mechanisms in the atomic-scale limit. Herein, we have designed a planar optical microcavity-confined MoS2/hBN/WS2 heterojunction, which realizes the strong coupling among donor exciton, acceptor exciton, and cavity photon mode. This configuration demonstrates an unconventional energy transfer via polariton relaxation, brightening MoS2 with a record-high enhancement factor of ~440, i.e., two-order-of-magnitude higher than the data reported to date. The polariton relaxation features a short characteristic time of ~1.3 ps, resulting from the significantly enhanced intra- and inter-branch exciton-exciton scattering. The polariton relaxation dynamics is associated with Rabi energies in a phase diagram by combining experimental and theoretical results. This study opens a new direction of microcavity 2D semiconductor heterojunctions for high-brightness polaritonic light sources and ultrafast polariton carrier dynamics.

Date: 2024
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DOI: 10.1038/s41467-024-45554-y

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